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2 days ago I upgraded my Samsung Galaxy S2 I9100G from 2.3.6 to 4.0.3 using the firmware XXLPQ. Ever since, my WiFi keeps disconnecting every 10 seconds. I tried all the fixes from this question SGS2 running ICS 4.0.3 can't connect to home wifi but it didn't workout for me.

My phone is rooted and I'd do anything to get the Wifi to work again... Help

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Is it from a specific network or this happens everywhere? –  nathpilland Jun 20 '12 at 21:35
    
I notice this mostly at home, I have a TP-Link router with WPA2 security. My device has a reserved IP on the router –  ComputerJy Jun 20 '12 at 21:49
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1 Answer

Well occasionally when you update firmware, your router at home will have problems with the new firmware on your phone (due to out-of-date drivers, old firmware on the router, router is unsupported by new firmware, etc.) So if it works everywhere else pretty well, this might be your issue.

My recommendation: try downloading a different kernel (there are plenty out there for the S2), your best bet looking on the XDA-Forums, maybe start here?

http://forum.xda-developers.com/forumdisplay.php?f=665

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Yup - Kernel's responsible for the WiFi drivers in your phone, so try using another kernel like Siyah. –  Sparx Jun 21 '12 at 6:09
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